改換門庭

to improve one's family's social status by moving up in the world / to switch one's allegiance to a new patron

to change / to alter / to transform / to correct

to change (sth) / to alter (sth) / to change over (to sth else)

to exchange / to change (clothes etc) / to substitute / to switch / to convert (currency)

gate / door / CL:扇[shan4] / gateway / doorway / CL:個|个[ge4] / opening / valve / switch / way to do something / knack / family / house / (religious) sect / school (of thought) / class / category / phylum or division (taxonomy) / classifier for large guns / classifier for lessons, subjects, branches of technology / (suffix) -gate (i.e. scandal; derived from Watergate)

main hall / front courtyard / law court